They're different players but Joelinton can dominate teams in a way that Willock will never be able to. There's a whole bunch of players that can do what Willock can but not many that can do what Joelinton can when he's on it.
Why are you trying to pass it slowly across the box six yards from your own goal surrounded by opposition attackers?
The one time he decides not to just leather it to the moon